Telephone receiver



Mav 26, 192.5. 1,539,306

V. DURBIN TELEPHONE RECEIVER Filed March 19 1923 Fgg Iig4r Ff Fig! Mg@ Eig/6.54

nga Fig/a g2g/f figg/fz Patented May 26, 1925.

UNITED ST'TES VERNON DURBIN', 0F NEWTON, MASSACHUSETTS, ASSIGNQR 'IPG THE HBTEP 'illfll ELECTRIC COMPANY, 0F RDXBURY, MASSHUSETTS, .i CORPBA'IIGN F oHUsETTs.

TELEPHOIIE RECEIVER.

Application filed Merch 19, 1923. Serial lo. @$5,942.

To all whom it may concer/n.:

ABev it kiiown,tliat I, VFnNoH Emeline citizen of the United States, residing .at Newton, in the county of Mioioilesenv and State of Massachusetts, have invented cer#v The present invention relates to en improvement in telephone receivers.

The object of the invention 'iste reorganize and improve the construction of suoli.

y receiversfor the purpose offacilitating the manufacture and reducing the cost. To the above ends the present invention consists in the receiver hereinafter described and pai ticularly defined in the claims.

In the accompanying drawings illustraiing the preferred forni of the invention, Fig.. l is a perspective View of one oi the ia1ninations of a inagneiJ core; Fig. 2 is a. perspective vieiv of a magnet core built up oi twelve laxninations; Fig. 3 is a plan and elevation of a spool iop; Fig. 4 is a plan and elevation of a core head insulator; Fig. 5 is an eleva-tion of a magnet core looking at the edges of the laminee; Fig. 6 is an elevation taken at right angles'to the plane of Fig. 5; Fig. 7 is a plan and elevation of a core head or spool bottoni; Fig. 8 is a bottoni plan and end View of the core shoe or back piece of a magnet; Figs. 9 and l() are front and side elevations of the magnet core, spool beads,

core head insulator and core head and core` shoe assembled; Figs. 11 and 12- are side and front elevations respectively of a magnet spoolv and winding assembly; Fig. i3 is a bottom plan of'a pair-vor" magnet spools; Fig. 1.4L is a side elevation of the same; Fig. l5 is a vtop pla-n of the saine; Fig. 16 is a per spc'ctive view of one ofthe permanent magnets; Fig. 17 is a perspecbive View of the magnetl cover; Figs. 18, 19 'and .20).are, re-Y spectively, a top plan, a side elevatinj, and a bottom plan of the terniinai/blooli; Fig., 21. is a sectional elevation oil ihe receiver faken on the line 2lb-21, Fig, 2Q, with the ear piece and diaphragm removed; Fig. is a plan vieivof the receiver with. the ear piece. and l' ein; and Fig'. f2.3 is a sectional elevaH l "l''. lil, mi ly!" lf.

The illnstaed embodiment 'of'iie invem tion is described as follows, and for i veniei'ice the descripi-ion will follow 'one order oi assembly of the elements and ilie ineilioclipraciiced in f' *senibling the receiver so as io present a graphic descripcion oi elle receiver, its con'iponeni elemenis, .ineiilioo of manufacture and asseinbiy.

The core laminas or laminaiions ere ysiamped with the shape shown in ci from sheet siiicon iron. Each lamina has an enlarged head 5l and a reduced fooi. Twelve of ihese-asseniblediogeiher make up Mthe conipieie core 53. These separare loose laminas gathered. Logetber are iirsi thrust through the hole in the spool top be, which hole is oi the sizeof the cross section of 'the body of the core This spool iop is pushed up against ille under side oi 'the head .o6-or pole piece oi? ehe built up sore and serves 'emporarilyto unite the layers' of the core inio a. iemporarily held be" This spooi iop is made oi balelite impor,- nated duck. Noni there is applied the core lhead insulator 57 .made of empire cloth, being a varnislied iresulailingcloth. This core head insulator is shown in temporary posin tion in rigs. 5 and. (i. Next. the core head or spool bottom 60 provided with a. lioie 6]. .is pushed on to the core, ihe hole-ill. being lie saine size as the bolos in 'the core head insulator and spool top. .This core' bead is provided with 'tivo brass eyeleis 65B inserted in the corners of the head, as showM in Fig. 7, for a purpose hereinaiier described. The core shoe G3, inode oi soit iron, is provided wiel-i a core hole @i and a screw hole 65. It is applied to the reduced. end

or 'foot piece 66 of ihe core 53, elle redinteii,`

end 6G entering the hole Sli, and, iiiing; ii; snugly, thereby 'acting to hold the lamina tions of the core together. The boiton'rsicie of the hole in the core shoe shown. in Figi".

is counterbored at 67, and aiier ilse fideos For@ bead 60 .are no Sii l il

' consists, of two down against the core shoe und occupy the posi tion shown in Figs. 9 and 10. This assem'nly 1s now u magnet spool ready to re-l ceive the windin s of the magnet between the core heed insu ator and spool top. These windings are applied in the usual munner und the completed magnet element or 'magnet spool assembly with the windings on the core is shown in Figs. 11 und 12. The core heed insulator of affording conveying the inside lead from the coil out to one of the eyelets 62 'Without liability of injury its own insulation, or to the insulation of the windings. otherwise in con tact therewith. The wire is enamel Wire, und the end is inserted through thev hole in the-.core heed insulator and extends outward between the core head insulator und thev core heed, being soldered et its outer end to one the eyelets 62. The other end of the coil .wire is run to the other cycle-t und soldered he it. The magnet spool assemblies are mede rights end leftsus seen in Figs. '13, 14: und 15. The inside leads from the coils are both connected to adjacent eyelets 02, es shown :it the bottom ci? Fig. 13, and the under sides of' which eyelets are united-hy the connecn jcion The outside leads ere carried to and soldered on the two eyelets 62, shown ce the top of Fig. 13.` Zito these eyeletsl ere secured the upwardly extended leed wires 71. The complete receiver electro-muguet assembly, indicated in e general `way by the reference character 72, is shown in Figs.- 13,

YThe permanent megnetfor the receiver rings SQ shown in Fig. .16 havingitheir north poles et one end es 'at N, und iheir south poles et ehe athen end, es et A magnet cover 83 consists `of a thin piece of sheet zinc nickel pleted on. its upper side. The magnet elements und net cover are provided with screw shown in Figs. 16 und 17.

The terminal block indicated in a general wey hy the reference character Se, und shown in Figs. 18, 19 und 20, consists of u, body portion 87 of insulating materiel such herd rubber or bolrelite.' It is provided with u screw threaded hole 88 to receive the threaded shank of the cord post 89. It is also nrovidcd with two cord terminal holes 90, wl ich receive the meeting cord. Vertical holes 91 are provided in the block to receive the terminal pieces or insets 92, which are forced down into the holes' 91, Terminal clips 93provided with ho esto receive the :bodies 01"' the terminal ieces, areheld in ace of the terminal blocks by small heads with which the pieces are provided. 'Euch terminel piece 92is provided with u hole to receive e set screw 94, the cord terminals being received in the holes 90, and the screws holes ns is provided for the pura convement meuns for r the corll u nion with the rigidity, and

.sltioning of t 1 the shape of the core or terminalsV of the con' position on the upper sur@` recelver box 100, of drawn aluminum, is provided with 'two holes in its bottom and three.

holes for the cord terminals und col-d post in one side, and two additional holes for the yoke or bail pivots arranged :it 000 to the position of the cord post and terminal holes; it is also provided on its outer upper edge with a threaded portion upon which an eur piece is adopted tobe screwed. It is first provided with two magnet screws 101, which extend upwardly through the holes in the bottom of the box, whereupon the magnet assembly 72 is lowered 'into ghe box, the holes in the core shoes receiving the screws 101. Then the two permanent mugnetsare inserted with their south poles superposed the one on 'the other, after which the magnet cover is dropped in place over the screws, niclreled side up. Then the nuts 102 are screwed down on the screws .101, .and the electro-magnet and permanent .magnets ore securely held in place in the box. The terrninel block is now dropped into place, und

jost is screwed into the hole 88 therein, whereby it is secured in place in the box. At this time the upper ends of the two lead wires 71 lie close to notches in the ends of the terminal clips 93. y a simple man nipulation the ends of these wires are brought to lie in the .notches in the terminal clips 4and are soldered fast. inasmuch as the cores are made up or" laminations their core shoe is not one of greet consequently when thus assembled some sli h deviation from correct poe ole heads accurate positioning of the relation to each other, c spool cover 103 is provided with two rectangular openings. of pole heads, which is forced over the core or head pole to bring them into correct position with relation to' eachother. It holds itself imposition by 1thel tight fit of the cover on the core or pole needs. The instrument is then completed by placing the diaphragm screwing on the eur piece 105.

With

as shown in Fig. 23.

is resilient und its'pinin the holes in the box commends itself to the and magnetic qualities and it commends it- 56 of the cores is possible. To correct this and to secure the pole tips with 104 in position undpressure of the fork or bail..-

125 reason of the simplicity of flee " remi pesi, received in the tapped openl :md air-ving te soeur@ the eiminai ',ieeir; 15e the bex, the terminal bleek else 'being pi'ovifiedf with termifim openings aiig'ning wiii the ierminei openings in the mx., sei'. screws in tile iei'mimii block adapt# ed in held external lead Wires within the ieiiiiixmi openings, terminal clips en the bleek', en eleetm-nmgnet.,Within fiile box, and connections between the terminal dips :1mi 'ahe chaire-magnet.

i2. A cere assembly for teiephene receivers.

iieving, iii eemiiiuatiou, a core having a bmiy poi'ien, an enimgexi head 0i' pcie piece and e 'i'ediwed foot, zi spool top on the core mijacen o ihe pole piece o the core, :i

eme heed en the core adjacent i0 the feet,

mici core shoe embracing' the foot, the feet, being riveted in the haie in the core cere for i telephone receiver magnet,

'consisting of e number of laminations of f eiiieeii iron su verpesed en each other hevimg si4 4body ef uniform size, eniergemenis en the eus el? he imiiiuetiofris ie ferm e, pele piece ein ene emi ef Lehe eer@ handy, emi e reduce@ perfion at 'the oppesi'e end mi, the eme body to form e foei:- ox eure shoe projection.

4. A mziggnei, eiemeiii for eiepiiene re ceiveis having, in eombiimieii, e, eeyfe eemprising e pimeity of imm lamine-dens each having en eniergement ai: (me and ai. reduced perioii or: fente?, tiieiiiei" end, a speci iep ef insuieting meixzi'iei having a, hoie ffiiig the bedy of the cere mid adepteni be engage lthewmder side e. time gioie piece, e: cere heed ef imsuieting materiel hai/ing 'a simile? haie fitting 'the body of the coe heated?. ediaeem; es the feet thereof, adapted. te ferm the bottom. heed of the sposi, said heed being provice with metallic seldeing pieces beyond the winiing.'

5. A eepheiue 'eeeivei heaving, in cem bineion, ai, permenem ma-gifle@ en eieerw magnet mag'neticeiiy eemieeed with the vided with terminal pieces ami terminal clips, e eoid peet having e redueeci shank ndapteei te pese; through e, hole in the bex and screw imm a, tapped iioe in the ermnei block for supporting :und securing 'he le@ ter in place in the bex.

VERNGN BURBUL 

